as a question of human behavior I really do not think any significant fraction of the car owning public is going to start any given day with less than a full charge on their car.

They will if it saves them substantial money in a way they can understand - note the effort the likes of mobile phone companies go to obscure the details of their plans so that people can't easily optimise. You only need nukes to solve this problem if you decide to structure the problem so that nukes are the opitimal solution.